Current rules, which are far looser than they were at the beginning:
Get tested before proceeding beyond hand jobs.
Try to have time with new partners primarily either be shared with time spent with other partners, or be when other partners are unavailable. The former is much easier when metamours enjoy each others' company, which ties into:
Have partners meet up early on to be sure they all get along well before getting serious, as my wife Ginko and I don't have time for relationships that have to be kept separate.
As for basic poly advice taught to me by Ginko: If your partner is unenthusiastic about trying polyamory, you have a much better chance of things going happily if you wait until they find someone to be excited about before proceeding yourself. Also, realize there may be no turning back at that point. At least no easy way.
Last edited by turtleHeart; 10-11-2012 at 09:58 AM.